Drainage basin map of the Sieg
|- elevation||603 m (1,978 ft)|
|Length||155.1 km (96.4 mi) |
|Basin size||2,857 km2 (1,103 sq mi) |
|- average||52 m3/s (1,800 cu ft/s)|
|Progression||Rhine→ North Sea|
The source is located in the Rothaargebirge mountains. From here the river runs southwestwards to the city of Siegen and the hills of Siegerland, both named after the river. Further west the Sieg valley forms the boundary of the Bergisches Land (northern) and Westerwald (southern). The river finally runs through a protected area east of the city of Bonn.
After passing the cities of Hennef and Siegburg, the river flows into the Rhine at the Naturschutzgebiet Siegaue, a protected area immediately to the northeast of the city of Bonn, near Niederkassel/Mondorf.
The Sieg Spring (German: Siegquelle), the source of the Sieg, is at an elevation of 603 metres (1,978 ft), near the village of Großenbach, North Rhine-Westphalia. The location was restored in 2013.
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